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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Operating revenues:      
Drilling - U.S. Land $ 2,523,518 $ 3,099,954 $ 2,785,449
Drilling - Offshore 241,043 250,811 221,863
Drilling - International Land 386,693 355,532 366,841
Other 14,187 13,410 13,461
Total operating revenues 3,165,441 3,719,707 3,387,614
Operating costs and expenses      
Operating costs, excluding depreciation 1,704,163 2,009,912 1,852,768
Depreciation 606,992 523,549 455,623
Asset impairment charge 39,242    
Research and development 16,104 15,905 15,235
General and administrative 134,906 135,139 126,250
Income from asset sales (11,716) (19,585) (18,923)
Total operating costs and expenses 2,489,691 2,664,920 2,430,953
Operating income from continuing operations 675,750 1,054,787 956,661
Other income (expense):      
Interest and dividend income 5,834 1,583 1,653
Interest expense (15,036) (4,654) (6,129)
Gain on sale of investment securities   45,234 162,121
Other (901) (636) (9)
Total other income (expense) (10,103) 41,527 157,636
Income (loss) from continuing operations before income taxes 665,647 1,096,314 1,114,297
Income tax provision 243,375 387,548 392,844
Income (loss) from continuing operations 422,272 708,766 721,453
Income (loss) from discontinued operations before income taxes (124) 2,758 14,701
Income tax provision (benefit) (77) 2,805 (485)
Income (loss) from discontinued operations (47) (47) 15,186
NET INCOME (LOSS) $ 422,225 $ 708,719 $ 736,639
Basic earnings per common share:      
Income from continuing operations (in dollars per share) $ 3.90 $ 6.54 $ 6.75
Income from discontinued operations (in dollars per share)     0.14
Net income (in dollars per share) 3.90 6.54 6.89
Diluted earnings per common share:      
Income from continuing operations (in dollars per share) 3.87 6.46 6.65
Income from discontinued operations (in dollars per share)     0.14
Net income (in dollars per share) $ 3.87 $ 6.46 $ 6.79
Weighted average shares outstanding (in thousands):      
Basic (in shares) 107,754 107,800 106,286
Diluted (in shares) 108,570 109,141 107,879